Worked as a teenagemaid at inn in Louvain, Belgium owned by a relative named Aubert. Aubert and his wife eventually sold the inn, each planning to enter religious life; Margaret planned to become a Cisterciannun. On their last night in the inn, thieves broke in and killed the erstwhile owners while Margaret was out. She came home as the killers were leaving, and she was murdered, too. Devotion developed after miracles occurred near her original gravesite beside the river.